| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/filter/gzip_source_stream.h" |
| |
| #include <algorithm> |
| |
| #include "base/logging.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/test/fuzzed_data_provider.h" |
| #include "net/base/io_buffer.h" |
| #include "net/base/test_completion_callback.h" |
| #include "net/filter/fuzzed_source_stream.h" |
| |
| // Fuzzer for GzipSourceStream. |
| // |
| // |data| is used to create a FuzzedSourceStream. |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
| net::TestCompletionCallback callback; |
| base::FuzzedDataProvider data_provider(data, size); |
| std::unique_ptr<net::FuzzedSourceStream> fuzzed_source_stream( |
| new net::FuzzedSourceStream(&data_provider)); |
| |
| // Gzip has a maximum compression ratio of 1032x. While, strictly speaking, |
| // linear, this means the fuzzer will often get stuck. Stop reading at a more |
| // modest compression ratio of 10x, or 2 MiB, whichever is larger. See |
| // https://crbug.com/921075. |
| size_t max_output = |
| std::max(10u * size, static_cast<size_t>(2 * 1024 * 1024)); |
| |
| const net::SourceStream::SourceType kGzipTypes[] = { |
| net::SourceStream::TYPE_GZIP, net::SourceStream::TYPE_DEFLATE}; |
| net::SourceStream::SourceType type = |
| data_provider.PickValueInArray(kGzipTypes); |
| std::unique_ptr<net::GzipSourceStream> gzip_stream = |
| net::GzipSourceStream::Create(std::move(fuzzed_source_stream), type); |
| size_t bytes_read = 0; |
| while (true) { |
| scoped_refptr<net::IOBufferWithSize> io_buffer = |
| base::MakeRefCounted<net::IOBufferWithSize>(64); |
| int result = gzip_stream->Read(io_buffer.get(), io_buffer->size(), |
| callback.callback()); |
| // Releasing the pointer to IOBuffer immediately is more likely to lead to a |
| // use-after-free. |
| io_buffer = nullptr; |
| result = callback.GetResult(result); |
| if (result <= 0) |
| break; |
| bytes_read += static_cast<size_t>(result); |
| if (bytes_read >= max_output) |
| break; |
| } |
| |
| return 0; |
| } |